builtin-show-ref.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "object.h"
   4 #include "tag.h"
   5
   6 static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*]";
   7
   8 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
   9         found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
  10 static const char **pattern;
  11
  12 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  13 {
  14         struct object *obj;
  15         const char *hex;
  16
  17         if (tags_only || heads_only) {
  18                 int match;
  19
  20                 match = heads_only && !strncmp(refname, "refs/heads/", 11);
  21                 match |= tags_only && !strncmp(refname, "refs/tags/", 10);
  22                 if (!match)
  23                         return 0;
  24         }
  25         if (pattern) {
  26                 int reflen = strlen(refname);
  27                 const char **p = pattern, *m;
  28                 while ((m = *p++) != NULL) {
  29                         int len = strlen(m);
  30                         if (len > reflen)
  31                                 continue;
  32                         if (memcmp(m, refname + reflen - len, len))
  33                                 continue;
  34                         if (len == reflen)
  35                                 goto match;
  36                         /* "--verify" requires an exact match */
  37                         if (verify)
  38                                 continue;
  39                         if (refname[reflen - len - 1] == '/')
  40                                 goto match;
  41                 }
  42                 return 0;
  43         }
  44
  45 match:
  46         found_match++;
  47         obj = parse_object(sha1);
  48         if (!obj) {
  49                 if (quiet)
  50                         return 0;
  51                 die("git-show-ref: bad ref %s (%s)", refname, sha1_to_hex(sha1));
  52         }
  53         if (quiet)
  54                 return 0;
  55
  56         hex = find_unique_abbrev(sha1, abbrev);
  57         if (hash_only)
  58                 printf("%s\n", hex);
  59         else
  60                 printf("%s %s\n", hex, refname);
  61         if (deref_tags && obj->type == OBJ_TAG) {
  62                 obj = deref_tag(obj, refname, 0);
  63                 hex = find_unique_abbrev(obj->sha1, abbrev);
  64                 printf("%s %s^{}\n", hex, refname);
  65         }
  66         return 0;
  67 }
  68
  69 int cmd_show_ref(int argc, const char **argv, const char *prefix)
  70 {
  71         int i;
  72
  73         for (i = 1; i < argc; i++) {
  74                 const char *arg = argv[i];
  75                 if (*arg != '-') {
  76                         pattern = argv + i;
  77                         break;
  78                 }
  79                 if (!strcmp(arg, "--")) {
  80                         pattern = argv + i + 1;
  81                         if (!*pattern)
  82                                 pattern = NULL;
  83                         break;
  84                 }
  85                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
  86                         quiet = 1;
  87                         continue;
  88                 }
  89                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
  90                         show_head = 1;
  91                         continue;
  92                 }
  93                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
  94                         deref_tags = 1;
  95                         continue;
  96                 }
  97                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
  98                         hash_only = 1;
  99                         continue;
 100                 }
 101                 if (!strncmp(arg, "--hash=", 7) ||
 102                     (!strncmp(arg, "--abbrev", 8) &&
 103                      (arg[8] == '=' || arg[8] == '\0'))) {
 104                         if (arg[3] != 'h' && !arg[8])
 105                                 /* --abbrev only */
 106                                 abbrev = DEFAULT_ABBREV;
 107                         else {
 108                                 /* --hash= or --abbrev= */
 109                                 char *end;
 110                                 if (arg[3] == 'h') {
 111                                         hash_only = 1;
 112                                         arg += 7;
 113                                 }
 114                                 else
 115                                         arg += 9;
 116                                 abbrev = strtoul(arg, &end, 10);
 117                                 if (*end || abbrev > 40)
 118                                         usage(show_ref_usage);
 119                                 if (abbrev < MINIMUM_ABBREV)
 120                                         abbrev = MINIMUM_ABBREV;
 121                         }
 122                         continue;
 123                 }
 124                 if (!strcmp(arg, "--verify")) {
 125                         verify = 1;
 126                         continue;
 127                 }
 128                 if (!strcmp(arg, "--tags")) {
 129                         tags_only = 1;
 130                         continue;
 131                 }
 132                 if (!strcmp(arg, "--heads")) {
 133                         heads_only = 1;
 134                         continue;
 135                 }
 136                 usage(show_ref_usage);
 137         }
 138         if (show_head)
 139                 head_ref(show_ref, NULL);
 140         for_each_ref(show_ref, NULL);
 141         if (!found_match) {
 142                 if (verify && !quiet)
 143                         die("No match");
 144                 return 1;
 145         }
 146         return 0;
 147 }